private CacheEntry PutData(string key, byte[] data, long ms_cost)
{
var now = DateTime.UtcNow;
lock(cache){
cache.changes_since_cleanse++;
CacheEntry entry;
if (cache.hash.TryGetValue(key, out entry)){
if (entry.data == null) entry.recreated_count++;
}else {
entry = new CacheEntry();
cache.hash[key] = entry;
entry.written = now;
entry.loaded = now;
}
entry.data = data;
entry.sizeInBytes = data.Length;
entry.cost_ms = (int)ms_cost;
MarkRead(entry);
return entry;
}
}
private bool TryGetData(string key, out byte[] data, out CacheEntry entry)
{
var now = DateTime.UtcNow;
lock(cache){
if (cache.hash.TryGetValue(key, out entry)){
//Take a reference before we exit the lock
data = entry.data;
if (data != null){
MarkRead(entry);
return true;
};
}
}
data = null;
return false;
}
private void MarkRead(CacheEntry e)
{
var now = DateTime.UtcNow;
if (e.recent_reads == null) e.recent_reads = new Queue<DateTime>(8);
if (e.recent_reads.Count > 7) e.recent_reads.Dequeue();
e.recent_reads.Enqueue(now);
e.read_count++;
}